input instruction

example/fibonacci.ly

@@ -7,6 +7,9 @@ func fibonacci(n) {
 }
 
 func main() {
-    appender = "The fibonacci number is "
-    print(appender + string(fibonacci(10)))
+    text = "input a number: "
+    print(text)
+    n = number(input())
+    text = "The fibonacci number of " + string(n) + " is " + string(fibonacci(10))
+    print(text)
 }

src/main/java/org/lucylang/ljvm/machine/instruction/GetInstruction.java

@@ -0,0 +1,32 @@
+package org.lucylang.ljvm.machine.instruction;
+
+import org.lucylang.ljvm.machine.Machine;
+import org.lucylang.ljvm.machine.Register;
+import org.lucylang.ljvm.machine.module.Module;
+import org.lucylang.ljvm.scope.OverdefinedException;
+import org.lucylang.ljvm.scope.UndefinedException;
+import org.lucylang.ljvm.type.TypeUnmatchedException;
+import org.lucylang.ljvm.value.StringValue;
+import org.lucylang.ljvm.value.ValueUnavailableException;
+
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class GetInstruction extends Instruction {
+    public GetInstruction(Operand value) {
+        this.type = Type.GET;
+        this.operands = new ArrayList<Operand>();
+        this.operands.add(value);
+
+        this.validSize = 1;
+        this.validRefs = new int[]{0};
+    }
+
+    @Override
+    public boolean executeValid(Machine vm, Module module) throws InvalidInstruction, TypeUnmatchedException, ValueUnavailableException, UndefinedException, OverdefinedException {
+        Register r = this.getRegister(vm, 0);
+        Scanner scanner = new Scanner(System.in);
+        r.assignValue(new StringValue(scanner.next()));
+        return false;
+    }
+}

src/main/java/org/lucylang/ljvm/machine/instruction/Type.java

@@ -5,5 +5,5 @@ public enum Type {
     PUSH, POP, PEEK, CALL, RET,
     GOTO, BEQ, BNE,
     NUM, STR, BOOL,
-    PUT
+    PUT, GET
 }

src/main/java/org/lucylang/ljvm/machine/module/Module.java

@@ -12,6 +12,11 @@ public class Module implements Serializable {
 
     public Module() {
         this.routines = new Scope<String, Routine>("module");
+        Routine input = new Routine(new Instruction[]{
+                new GetInstruction(new RefOperand("value")),
+                new PushInstruction(new RefOperand("value")),
+                new RetInstruction()
+        });
         Routine print = new Routine(new Instruction[]{
                 new PopInstruction(new RefOperand("value")),
                 new PutInstruction(new RefOperand("value"))
@@ -34,6 +39,7 @@ public Module() {
                 new PushInstruction(new RefOperand("$1")),
                 new RetInstruction()
         });
+        this.routines.set("input", input);
         this.routines.set("print", print);
         this.routines.set("string", string);
         this.routines.set("number", number);